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StandardHeader – FIX 4.0 – FIX Dictionary

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FIX 4.0 : StandardHeader

Structure | Used In

Description

Each message, administrative or application, is preceded by a standard header. The header is used to identify the message type, length, destination, sequence number, origination point and time.

Two fields are provided for use when resending messages. The PossDupFlag <43> is set when resending a message as the result of a session level event (i.e. the retransmission of a message reusing a sequence number). The PossResend <97> is set when reissuing a message with a new sequence number (e.g. resending an order). The receiving application should process these messages as follows:

  • PossDupFlag <43> — if a message with this sequence number has been previously received, ignore message, if not, process normally.
  • PossResend <97> — forward message to application and determine if previously received (i.e. verify order id and parameters)

Structure

Tag Field Name Req'd Comments
8 BeginString Y

FIX.4.0 (Always unencrypted, must be first field in message)
9 BodyLength Y

(Always unencrypted, must be second field in message)
35 MsgType Y

(Always unencrypted, must be third field in message)
49 SenderCompID Y

(Always unencrypted)
56 TargetCompID Y

(Always unencrypted)
115 OnBehalfOfCompID N

Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
128 DeliverToCompID N

Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
90 SecureDataLen N

Required to identify length of encrypted section of message. (Always unencrypted)
91 SecureData N

Required when message body is encrypted. Always immediately follows SecureDataLen <90> field.

34 MsgSeqNum Y

(Can be embedded within encrypted data section.)
50 SenderSubID N

(Can be embedded within encrypted data section.)
57 TargetSubID N

'ADMIN' reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.)
116 OnBehalfOfSubID N

Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
129 DeliverToSubID N

Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
43 PossDupFlag N

Always required for retransmissions, whether prompted by the sending system or as the result of a resend request. (Can be embedded within encrypted data section.)

97 PossResend N

Required when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.)

52 SendingTime Y

(Can be embedded within encrypted data section.)
122 OrigSendingTime N

Required for message resends. If data is not available set to same value as SendingTime <52> (Can be embedded within encrypted data section.)

Used In
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